Aiming at the difficulties in forming the bottom of rectangle plate and high wrapping force caused by the deep cavity

the mould structure with movable inserts and ejecting by fixed mould was adopted. A movable insert on which overflow well is designed is set on the bottom of the deep cavity far away from the gate

which is beneficial for the formation of bottom of deep cavity. The movable insert and the castings were ejected together and then the former was taken away. Two parting surfaces were set on the mould

in which liable limit-distance mechanism was applied. Cavity plate of fixed die was taken as stripping plate

which eliminated the wrapping force to keep the castings stay in the movable die during secondary parting.